BRUEL & KJAER System V - System Interconnection; Fan Motor Fuses

381 mm (15 ini
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70 mm (2,75 ini
15 mm (0.59 i ni
212181 / 1
Fig. 2 . 4 . Bas e p/ate dime nsio ns for 4801 T
2.2.1. System Interconnection
The Type 4801 Exciter Body is supplied with two captive cables. One of these is a five-
core cable,
which carries three-phase mains power to the Exciter Body. It includes a neu -
tral and an earth . The other is the safety trigger cable . When the 4801 is used with a
suitable B & K amplifier such as Types 2707 or 2708, this cable is used to initiate shut-
down in the event of overheat ing of the field coil, loss of a supply phase or blowing of
one of the fuses on the safety circuit board. Shutdown includes removal of both the exci-
tation and the three-phase supply f rom the Exciter.
For
connection of these cables to a B & K Amplifier Type 2707 or 2708 , refer to the in-
struction manuals for these instruments . If the 4801 is to be connected to an older am-
plifier Type 2707 , having si ngle-phase power requirements, consult your B & K represen-
tative . Remember to reduce CURRENT LIMIT to alevei appropriate to the head in use,
especially
with the more powerfu l Amplifier Type 2708 .
For maximum operating safety the green / yellow conductor in the power cable must be
connected
to a suitable earth, such as the protective earth contact of a mains socket out -
let . The use
of extension cables without protective conductor sha.1I be avoided.
Connection of th e Exciter Head to the power amplifier is made via drive cable AQ 0026 ,
which has a 3-pin connector at each end. Either end may be connected to the Exciter
Head.
2.2.2 . Fan Motor Fuses
The
three fan - motor fuses are situated on the safet y circuit board. To gain access to
them remove th e base cover of the Exciter, which is held in place by four screws. See
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